Clayton, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.7 °C (low) to 20.4 °C (high). Annual precipitation averages 1770.4 Millimeters. Clayton is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.9 °C | 10 °C | 161.8 mm |
| February | -0.7 °C | 12.1 °C | 149.86 mm |
| March | 2.6 °C | 16 °C | 155.7 mm |
| April | 6.7 °C | 20.8 °C | 144.53 mm |
| May | 11.6 °C | 24.6 °C | 122.68 mm |
| June | 15.8 °C | 27.9 °C | 148.34 mm |
| July | 17.8 °C | 29.6 °C | 151.13 mm |
| August | 17.3 °C | 29 °C | 151.89 mm |
| September | 14.1 °C | 26.3 °C | 145.8 mm |
| October | 7.8 °C | 21.3 °C | 122.17 mm |
| November | 2.2 °C | 16.1 °C | 139.95 mm |
| December | -0.5 °C | 11.6 °C | 176.53 mm |
| Annual | 7.7 °C | 20.4 °C | 1770.38 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |